Giant rock crabs are massive versions of the weaker Rock crab. They lie in wait for prey, disguised as large boulders. When approached, they attack, unless they have become tolerant, in which case they remain as "boulders" - attempting to cast a spell on them gives the message "You can't attack this NPC."

Giant rock crabs are only initially aggressive if they are approached while dormant. Once they are moving and the targeted player is out of range, they stop being aggressive and will ignore players that don't attack them. They eventually become dormant boulders again after a while if they are not attacked.



The giant rock crab is one of few monsters in RuneScape that will retreat from battle when they become critically wounded. This can be troublesome, as they are found in a single-way combat area. This can be prevented by attacking them while their back is turned to a nearby wall, so that they move away from the player and back up into the wall. If they move too far away, the player will follow them and risk being attacked by another rock crab. There are several protruding sections of the walls in the area that can be used as safespots which are ideal as the crabs' main weakness is magic.



Item Quantity Rarity GE market price
Bones Bones 1 Always 44


Item Quantity Rarity GE market price
Water rune Water rune 1–39 Uncommon 5–195
Earth rune Earth rune 2–37 Uncommon 8–148
Air talisman Air talisman 1 Rare 71
Mind talisman Mind talisman 1 Rare 2,955
Fire talisman Fire talisman 1 Rare 2,124
Cosmic talisman Cosmic talisman 1 Rare 441
Body talisman Body talisman 1 Rare 527
Water talisman Water talisman 1 Rare 145
Earth talisman Earth talisman 1 Rare 260


Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 Uncommon 888
Black claws Black claws 1 Uncommon 533
Black platebody Black platebody 1 Uncommon 2,692
Mithril axe Mithril axe 1 Uncommon 132
Rock-shell gloves Rock-shell gloves 1 Uncommon 405
Rock-shell boots Rock-shell boots 1 Uncommon 628
Black warhammer Black warhammer 1 Rare 380
Adamant longsword Adamant longsword 1 Rare 1,660
Adamant warhammer Adamant warhammer 1 Rare 2,176


Item Quantity Rarity GE market price
Poison ivy seed 5 Poison ivy seed 1 Uncommon 25
Belladonna seed 5 Belladonna seed 1 Uncommon 61
Herb seed 5 Guam seed 1 Uncommon 14
Herb seed 5 Marrentill seed 1 Uncommon 7
Herb seed 5 Tarromin seed 1 Uncommon 10
Herb seed 5 Harralander seed 1 Uncommon 17
Herb seed 5 Toadflax seed 1 Rare 382
Herb seed 5 Ranarr seed 1 Rare 49,441
Herb seed 5 Irit seed 1 Rare 41
Herb seed 5 Avantoe seed 1 Rare 1,148
Herb seed 5 Snapdragon seed 1 Rare 60,169
Herb seed 5 Cadantine seed 1 Rare 1,789
Herb seed 5 Lantadyme seed 1 Rare 2,564
Herb seed 5 Dwarf weed seed 1 Very rare 696
Herb seed 5 Torstol seed 1 Very rare 54,588


Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Uncommon 17
Grimy marrentill Grimy marrentill 1 Uncommon 19
Grimy tarromin Grimy tarromin 1 Uncommon 193
Grimy harralander Grimy harralander 1 Uncommon 597
Grimy ranarr weed Grimy ranarr weed 1 Rare 7,705
Grimy irit leaf Grimy irit leaf 1 Rare 946
Grimy avantoe Grimy avantoe 1 Rare 1,873
Grimy kwuarm Grimy kwuarm 1 Rare 1,239
Grimy cadantine Grimy cadantine 1 Rare 1,663
Grimy lantadyme Grimy lantadyme 1 Rare 1,469
Grimy dwarf weed Grimy dwarf weed 1 Rare 513


Item Quantity Rarity GE market price
Coins 100 Coins 27; 28; 42; 70; 137 Common Not sold
Raw lobster Raw lobster 1 Common 130
Raw bass Raw bass 1 Common 299
Tinderbox Tinderbox 1 Common 45
Rock-shell splinter Rock-shell splinter 1 Uncommon (1/64) 21,030
Rock-shell chunk Rock-shell chunk 1 Uncommon (1/64) 10,774
Rock-shell shard Rock-shell shard 1 Uncommon (1/64) 17,776
Casket Casket 1 Rare 749
Clue scroll (medium) Clue scroll (medium) 1 Very rare Not sold

Gem drop table

In addition to the drops above, this monster has access to the gem drop table.

Show/hide gem drop table
Item Quantity Rarity GE market price
Uncut sapphire Uncut sapphire 1 Rare 534
Uncut emerald Uncut emerald 1 Rare 715
Uncut ruby Uncut ruby 1 Rare 1,382
Nature talisman Nature talisman 1 Very rare 727
Uncut diamond Uncut diamond 1 Very rare 2,844
Rune javelin Rune javelin 5 Very rare 835
Loop half of key Loop half of key 1 Very rare 9,762
Tooth half of key Tooth half of key 1 Very rare 9,688
Rune spear Rune spear 1 Very rare 11,940
Shield left half Shield left half 1 Very rare 65,616
Dragon spear Dragon spear 1 Very rare 37,395
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